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| Number | Title | Issue Date |
| 7897133 | Process for conversion of waste fluid streams from chemical processing plants to beneficiary agriculture products The present invention is directed to the conversion of gas streams comprising ammonia, hydrogen sulfide, and water in the form of liquids or gases that are generated by petroleum refineries and coke ovens to beneficiary agriculture products, by forming ammonium sulf... | 03/01/2011 |
| 7393378 | Method for recovering purified sodium bicarbonate and ammonium sulfate A process for recovering sodium bicarbonate and ammonium sulfate from a sodium sulfate solution. The sodium sulfate solution can be pure or contain other compounds such as sodium sulfite, carbonate, chloride, fluoride, nitrate and nitrite as would be the case if the... | 07/01/2008 |
| 7223375 | Emission control systems and methods thereof A method and system for controlling one or more emissions includes introducing ammonia to react with at least a portion of sulfur trioxides in an exhaust emission and result in at least one or more ammoniated compounds. At least a portion of fly ash particles and th... | 05/29/2007 |
| 7204968 | Method of producing heat energy Energy in the form of heat is recoverable and controllable in a process that reacts an acid and a base in the presence of steam. The recovered heat energy can be used to vaporize water to form steam which when used in conjunction with a turbine will produce electric... | 04/17/2007 |
| 6737380 | Solid acid catalyst, production method thereof, and method for hydrodesulfurizing and isomerizing light hydrocarbon oil using the same A process for producing a solid acid catalyst, which comprises: adding a pseudoboehmite as a binder to a sulfated zirconium hydroxide, followed by kneading with an aqueous solution containing at least one metal of the Group VIII, or loading at least one metal of the... | 05/18/2004 |
| 6544492 | Regeneration method for process which removes hydrogen sulfide from gas streams A process is provided for the removal of hydrogen sulfide out of a gaseous stream (22), such as a natural gas, by contacting the hydrogen sulfide containing gas with a sorbing liquid (26) containing a tertiary amine so that the hydrogen sulfide is sorbed ... | 04/08/2003 |
| 6531108 | Process for producing free hydroxylamine aqueous solution This invention provides a highly pure and highly concentrated free hydroxylamine aqueous solution substantially not containing any salt or organic substance. This invention is a process for obtaining a free hydroxylamine aqueous solution, comprising the s... | 03/11/2003 |
| 6419887 | Process for the treatment of residual liquors from the ammoniation and carbonation of alkali metal salts A process for the treatment of residual liquors from the ammoniation and carbonation of alkali metal salts containing ammonium salts, sodium salts, soluble sodium bicarbonate, ammonium bicarbonate and water and producing purified ammonium salts, comprisin... | 07/16/2002 |
| 6106796 | Method of ammonium sulfate purification A process is provided for recovering sodium bicarbonate and ammonium sulfate from a solution containing sodium sulfate derived from a process for removing sulfur contaminants out of a gas with sodium bicarbonate reagent. Sodium bicarbonate is precipitated... | 08/22/2000 |
| 5834722 | Method and apparatus for treating waste gases by exposure to electron beams The improved method for treating waste gases by exposure to electron beams which comprises adding ammonia to a waste gas containing sulfur oxide (SOx) and/or nitrogen oxides (NOx) and thereafter exposing the gas to an electron beam s... | 11/10/1998 |
| 5618511 | Process for producing ammonium sulfate from flue-gas scrubber waste liquor A flue-gas scrubbing-liquor regeneration process that is based on contacting N-S compounds contained in a flue-gas scrubbing liquor with a lime/limestone solution in a double draw-off crystallizer under suitable pH conditions for precipitating calcium sal... | 04/08/1997 |
| 5455015 | Method for the removal of sulfur and nitrogen oxides from gases using sulfate and hydrogen sulfate salt baths Sulfur oxides are removed from a gas containing same by contacting the gas with a system including ammonium, potassium, and/or sodium salts in a solid phase and ammonium, sodium, and/or potassium hydrogen sulfate in a liquid phase. The sulfur oxides react... | 10/03/1995 |
| 5362458 | Process for the simultaneous absorption of sulfur oxides and production of ammonium sulfate Process for the removal of sulfur oxides from sulfur oxide-containing gas with simultaneous production of ammonium sulfate. The process is carried out by first passing hot sulfur oxide-containing gas through a prescrubber wherein the gas contacts saturate... | 11/08/1994 |
| 5330733 | Method for removing pollutants from a combustion gas A combustion gas is cooled a first time to about 110° C. in a first cooling chamber (3), up to 90% of the ashes is removed in a first precipitator (9) then the gas is cooled again in a second cooling chamber (10), to about 80° C.; in a reaction chamber ... | 07/19/1994 |
| 5330544 | Process and apparatus for increasing the size of ammonium sulfate crystals The average size of ammonium sulfate crystals is increased by passing undersized ammonium sulfate crystals through a multistage apparatus in which the crystals are contacted with an aqueous ammonium sulfate spray in a first heated chamber to increase the ... | 07/19/1994 |
| 5273727 | Flue gas purification and production of dry ammonium bisulfites and bisulfates A system is provided for converting flue gas pollutants to useful dry or concentrated ammonium bisulfite and ammonium bisulfate byproducts and other harmless byproducts, and for collecting the useful byproducts. The system also removes particulate materia... | 12/28/1993 |
| 5258168 | Production of alunites Disclosed is a method for preparing high purity alunite. In the method, a material selected from the group consisting of sodium sulfate, sodium bisulfate, ammonium sulfate, ammonium bisulfate, potassium sulfate and potassium bisulfate is provided and reac... | 11/02/1993 |
| 5230870 | Method for converting noxious pollutants from flue gas into merchantable by-products A system and method of converting flue gas pollutants to marketable byproducts of ammonium bisulfite and ammonium bisulfate, which are collected, and to other harmless byproducts which may be safely discharged is provided. The system removes as much parti... | 07/27/1993 |
| 5225175 | Self-scrubbing removal of submicron particles from gaseous effluents The invention comprises a method and a system for separating very fine particulates from gaseous effluents resulting from the burning of coal or other fossil fuels, or from other combustion processes, such particulates being too small for typical methods ... | 07/06/1993 |
| 5198201 | Removal of sulphur and nitrogen oxides from flue gases A method and apparatus are disclosed for removing pollutants, especially oxides of sulphur and nitrogen, from boiler plant flue gases. A series of heat exchange steps cool the gas and condense acidic condensates. SO3 is removed by condensation,... | 03/30/1993 |
| 5141732 | Process for the removal of ammonium sulphate from tarrich waste streams from the production of (meth) acrylonitrile The ammonium sulphate contained in tar-rich waste streams from the production of (meth)acrylonitrile can be precipitated out by adding 1 to 30 times the amount by weight of methanol, relative to the water content of the waste stream, and additionally 0.05... | 08/25/1992 |
| 5122352 | Heat exchanger and pollutant removal system A system for cooling flue gases from a fossil fuel boiler plant, and removing pollutants from the flue gas, is disclosed. In a first section of the apparatus, heat exchange cools the flue gas to just above the condensation point of water, and condensed H | 06/16/1992 |
| 5051245 | Ammonia for the desulfurization of sulfur containing gases A process for the reduction of sulfur oxides from flue gases is provided in which ammonia is added to the flue gas to precipitate out (NH4)2 SO4. The (NH4)2 SO4 is collected and can be sold as a... | 09/24/1991 |
| 5047218 | Sweetening of sulfur-containing gases using ozone A process which reduces the amount of sulfur compounds present in a feed gas is disclosed. A gas containing sulfur compounds is admixed with an ozone-containing gas. This admixture is then contacted with a scrubbing composition to obtain a gas and a produ... | 09/10/1991 |
| 4908161 | Fire retardant for isocyanate-based foams comprising ammonium sulfate and a cyanuric acid derivative Ammonium sulfate powder is employed, alone, or in conjunction with a weakly basic powder to neuturalize the acidity of the sulfate, as a flame retardant for isocyanate-based foams and, in particular, rigid and flexible polyurethane foams.... | 03/13/1990 |
| 4852996 | Process for gasifying coal Part of the synthesis gas produced by coal gasification in an allothermically heated fluidized bed reactor is burned after removal of dust and sulfur and serves as a source of energy to heat the reactor by indirect heat exchange and to produce the steam r... | 08/01/1989 |
| 4853193 | Process for removing NOx and SOx from a gaseous mixture A combination gas denitrogenation and desulfurization process is provided in which a gaseous mixture comprising NOx, SOx and O2 is reacted with excess NH3 to reduce the NOx to N2 and the re... | 08/01/1989 |
| 4822575 | Process for the purification of zirconium compounds The invention concerns processes for the preparation of zirconium compositions which on calcination form zirconia. The zirconium compositions are prepared by the addition of an ammonia source to an aqueous zirconium sulfate solution to give a solution pH ... | 04/18/1989 |
| 4762546 | Production of high-grade nitrogen-sulfur suspension fertilizers The present invention teaches novel compositions and techniques for economically producing highly concentrated nitrogen-sulfur suspension fertilizers using cheap and readily available by-product ammonium sulfate or by-product sulfuric acid and ammonia in ... | 08/09/1988 |
| 4707294 | Preparation of alcoholic hydroxylamine solution from hydroxylammonium sulfate Solid hydroxylammonium sulfate is reacted with an alcohol solution of an alkali metal hydroxide or alkoxide to produce an alcoholic hydroxylamine liquid phase and a sulfate-containing solid phase. The liquid phase may be used for further reactions such as... | 11/17/1987 |
| 4690807 | Process for the simultaneous absorption of sulfur oxides and production of ammonium sulfate Process and apparatus for the removal of sulfur oxides from sulfur oxide-containing gas with simultaneous production of ammonium sulfate. The process is carried out in a single vessel having an ammonium sulfate scrubbing zone; an ammonium sulfate liquor r... | 09/01/1987 |
| 4677074 | Process for reducing sulfur-containing contaminants in sulfonated hydrocarbons Processes of reducing the inorganic sulfur-containing acid and the low equivalent weight organic sulfonic acid content of an acid mass comprising organic sulfonic components and inorganic sulfonating agent contaminants are described. In general, the proce... | 06/30/1987 |
| 4649033 | Process to eliminate air pollutants which result from the combustion of fuels containing sulphur Process to eliminate air pollutants which result from the combustion of fuels containing sulphur, permitting the transformation of substantially all the existing SO2 and SO3 produced by the combustion of fuels to ammonium sulphate.... | 03/10/1987 |
| 4590048 | Removal of sulfur oxides from gas streams with ammonium sulfite A process is disclosed to produce a commercially valuable concentrated nitrogen sulfur solution by scrubbing sulfur dioxide from flue and other gases using ammonium sulfite solution as a scrubbing media. The process also has the capability of removing the... | 05/20/1986 |
| 4559277 | Ceramic and aluminum alloy composite A ceramic-aluminum alloy composite in which residual stress between the ceramic and aluminum components is substantially eliminated and strong cohesion is provided between the components of the composite over a wide temperature range. The composite of the... | 12/17/1985 |
| 4551324 | Preparation from hydroxylammonium sulfate of other hydroxylammonium salts via alcoholic hydroxylamine Solid hydroxylammonium sulfate is reacted with an alcohol solution of an alkali metal hydroxide or alkoxide to produce an alcoholic hydroxylamine liquid phase and a sulfate-containing solid phase. The liquid phase is further reacted with an acid other tha... | 11/05/1985 |
| 4551323 | Preparation of alcoholic hydroxylamine solution from hydroxylammonium sulfate Solid hydroxylammonium sulfate is reacted with an alcohol solution of an alkali metal hydroxide or alkoxide to produce an alcoholic hydroxylamine liquid phase and a sulfate-containing solid phase. The liquid phase may be used for further reactions such as... | 11/05/1985 |
| 4541999 | Method for removing acidic components including nitrogen oxide from waste gases A method of simultaneously removing SOx and NOx from waste gases. Using a known desulfurization process the waste gases free of the acidic components are contacted with an oxidizing agent in the gas phase for the oxidation of the oxy... | 09/17/1985 |
| 4524049 | Process for concurrent steam generation and metal recovery Vanadium and nickel are recovered from fluid coke or fly ash concurrently with cogeneration of steam by a wet oxidation process at 500°-650° F. and elevated pressure, with a leaching pH of approximately 0.3 maintained by generation of sulfuric acid in s... | 06/18/1985 |
| 4511675 | Method for regenerating water polishers using ammonium sulphate A process for regenerating the anion and cation exchange resins used for polishing water for steam generation allows the polishers to be operated with reduced effluent levels of sodium, chloride and sulfate to prevent corrosion of the steam turbine power ... | 04/16/1985 |
